Classic undersaddle ceramic guitar pickup, AG-Series pickups do not require a battery and can be plugged directly into the amp of your choice. AG-Series pickups’ performance can be greatly enhanced with the use of an impedance-matching preamp such as Platinum Stage, Platinum Pro EQ or Powerjack.Features:Fishman’s piezo crystal passive undersaddle pickupPowerjack Active Endpin Jack Preamp or Powerjack Onboard Preamp available as optional accessoriesAn impedance matching preamp is recommended, but not requiredProfessional installation recommendedSpecsSaddle Width: 1/8” (3.2 mm)String Spacing: 2.125” (54 mm) E to E.